30. how many grams of boric acid, b (oh) 3 (fm 61.83), should be used to make 2.00 l of 0.050 0 m solution? what kind of fl ask is used to prepare this solution?

Mass = 6.183 g

Solution:

Step 1: Calculate number of moles of Boric acid using following formula,

Molarity = Moles : Volume

Solving for Moles,

Moles = Molarity * Volume

Putting Values,

Moles = 0.05 mol. L⁻¹ * 2.0 L

Moles = 0.1 mol

Step 2: Calculate Mass of Boric Acid using following formula,

Moles = Mass : M. mass

Solving for Mass,

Mass = Moles * M. mass

Putting values,

Mass = 0.1 mol * 61.83 g. mol⁻¹

Mass = 6.183 g

Flask used to prepare this solution is called as Volumetric flask. Take 2 L volumetric flask, add 6.183 g of Boric acid and fill it to the mark with distilled water.